如何仅设置 tikz 节点的边框颜色的一侧？

Question

我想要一个具有不同边框颜色的节点：一个用于上边框和左边框，一个用于下边框和右边框颜色。

这可能吗？从我找到的所有示例来看，似乎我只能整体设置颜色，而不能为每一侧设置颜色。

Answer 1

这应该可以让你入门了。还可以做更多的润色，但留作练习。

\documentclass{article}
\usepackage{tikz}
\tikzset{%
pics/.cd,
mynode/.style args={#1#2#3}{
  code={\node (a) {#3};
       \draw[thick,#1] (a.south west) |- (a.north east);
       \draw[thick,#2] (a.south west) -| (a.north east);
  }
},
}
\begin{document}
  \begin{tikzpicture}
    \pic {mynode={red}{blue}{Here}};
    \pic at (4,0) {mynode={olive}{magenta}{Here comes another one}};
  \end{tikzpicture}
\end{document}

\documentclass{article}
\usepackage{tikz}
\tikzset{%
pics/.cd,
mynode/.style args={#1#2#3}{
  code={\node (a) {#3};
       \draw[thick,#1,line cap=butt,shorten <= -0.5\pgflinewidth,shorten >= 0.5\pgflinewidth] (a.south west) |- (a.north east);
       \draw[thick,#2,line cap=butt,shorten <= 0.5\pgflinewidth,shorten >= -0.5\pgflinewidth] (a.south west) -| (a.north east);
  }
},
}
\begin{document}
  \begin{tikzpicture}
    \pic {mynode={red}{blue}{Here}};
    \pic at (4,0) {mynode={olive}{magenta}{Here comes another one}};
  \end{tikzpicture}
\end{document}